error ó querer borrar ou grabar un CD-RW

hola
é a primeira vez que uso Trisquel e teño problemas para grabar co
programa que trae gnomeBaker

o error é o seguinte:

scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Error trying to open /dev/hdc exclusively (Device or resource busy)...
retrying in 1 second.
Error trying to open /dev/hdc exclusively (Device or resource busy)...
retrying in 1 second.
Error trying to open /dev/hdc exclusively (Device or resource busy)...
retrying in 1 second.
Error trying to open /dev/hdc exclusively (Device or resource busy)...
retrying in 1 second.
Error trying to open /dev/hdc exclusively (Device or resource busy)...
giving up.
scsidev: 'ATA:/dev/hdc'
TOC Type: 1 = CD-ROM
devname: 'ATA:/dev/hdc'
scsibus: -2 target: -2 lun: -2
wodim: No such file or directory.
Cannot open SCSI driver!
For possible targets try 'wodim --devices' or 'wodim -scanbus'.
For possible transport specifiers try 'wodim dev=help'.
For IDE/ATAPI devices configuration, see the file README.ATAPI.setup
from
the wodim documentation.

¿algúen sabe cómo o podo solucionar?

Nota: tamén intentei instalar o K3b pero dame moitos errores de
dependencias, así que preferiría conseguir usar o gnomebaker

un saudo
rami

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